Note this affects only basic columns like uid, deleted and language
handling related fields like sys_language_uid, but not a tables main
business fields like a "title" field for a news extension. Those still have to
be defined by extension authors. No column definitions are created from the
columns section of a tables TCA.

However, ext_tables.sql file can be stripped down to business fields.
For example, if a TCA definition of a table specifies
$GLOBALS['TCA']['myTable']['ctrl']['sortby']='sorting',
the core will automatically add the column sorting with an appropriate
definition.

Field definitions in ext_tables.sql take precedence over automatically
generated fields, so the core never overrides a manually specified column definition
from an ext_tables.sql file.

These columns below are automatically added if not defined in ext_tables.sql
for database tables that provide a $GLOBALS['TCA'] definition:

uid and PRIMARYKEY

If removing the uid field from ext_tables.sql, the PRIMARYKEYmust be removed, too.

pid and KEYparent

Column pid is unsigned if the table is not workspace aware, the default
index parent includes pid and hidden as well as deleted
if the latter two are specified in TCActrl. The parent index creation
is only applied if column pid is auto generated, too.

['ctrl']['tstamp']='fieldName'

Often set to tstamp or updatedon

['ctrl']['crdate']='fieldName'

Often set to crdate or createdon

['ctrl']['cruser_id']='fieldName'

Often set to cruser or createdby

['ctrl']['delete']='fieldName'

Often set to deleted

['ctrl']['enablecolumns']['disabled']='fieldName'

Often set to hidden or disabled

['ctrl']['enablecolumns']['starttime']='fieldName'

Often set to starttime

['ctrl']['enablecolumns']['endtime']='fieldName'

Often set to endtime

['ctrl']['enablecolumns']['fe_group']='fieldName'

Often set to fe_group

['ctrl']['sortby']='fieldName'

Often set to sorting

['ctrl']['descriptionColumn']='fieldName'

Often set to description

['ctrl']['editlock']='fieldName'

Often set to editlock

['ctrl']['languageField']='fieldName'

Often set to sys_language_uid

['ctrl']['transOrigPointerField']='fieldName'

Often set to l10n_parent

['ctrl']['translationSource']='fieldName'

Often set to l10n_source

l10n_state

Column added if languageField and transOrigPointerField are set

['ctrl']['origUid']='fieldName'

Often set to t3_origuid

['ctrl']['transOrigDiffSourceField']='fieldName'

Often set to l10n_diffsource

['ctrl']['versioningWS']=true - t3ver_* columns

Columns that make a table workspace aware. All those fields are prefixed with
t3ver_, for example t3ver_oid and t3ver_id. A default
index named t3ver_oid to fields t3ver_oid and t3ver_wsid is
added, too.